a   b   i  x          y
pan pan 1  0.34679014 1
eks pan 2  0.75867996 2
wye wye 3  0.20460331 6
eks wye 4  0.38139939 24
wye pan 5  0.57328892 120
zee pan 6  0.52712616 720
eks zee 7  0.61178406 5040
zee wye 8  0.59855401 40320
hat wye 9  0.03144188 362880
pan wye 10 0.50262601 3628800
